On CarFax: look for consistent service intervals. Red flags: gaps between oil changes, no transmission/differential service, or accident history even if "minor."
CarFax — what to look for on every car
No accidents or structural damage
Walk away from frame/structural damage regardless of price
Consistent oil changes every 5–7k miles
Gaps over 10k miles = warning sign
No salvage, flood, or lemon law brands
Never buy regardless of price
Odometer consistent — no rollback flags
Service at dealers or known shops — not just Jiffy Lube
Subaru (Crosstrek, Forester, Outback)
CVT fluid change at or before 30k miles
Most critical item. Subaru calls it "lifetime" fluid — it isn't. Skipped CVT service = #1 cause of early Subaru transmission failure
Front and rear differential fluid changed ~30k miles
Spark plugs — iridium ~60k · budget ~$200–300 if not done
Brake fluid — every 2–3 years regardless of mileage
Check date not just mileage — often skipped
No head gasket history — ask and have mechanic inspect
Honda (HRV, CR-V)
CVT fluid — inspect at 30k, change if needed
CR-V 2017–2021: ask about oil dilution history
1.5T turbo in cold weather — 2022+ resolves this
Rear differential fluid (AWD) — inspect by 30k
Spark plugs — iridium, rated to 100k
Brake fluid — within last 2–3 years
Toyota (RAV4, Corolla Cross)
Transmission fluid — 8-speed auto, service by 60k
Spark plugs — iridium, rated to 60–120k
Brake fluid — within last 2–3 years
AWD rear differential fluid — often overlooked
Mazda CX-5
Auto transmission fluid — 6-speed, change by 45k
Front and rear differential fluid — by 45k
Often skipped at independent shops — ask specifically
Spark plugs — iridium, rated to 75k · budget ~$150–250
Brake fluid — within last 2–3 years
All cars — universal
Pre-purchase inspection at independent mechanic — $100–150
Do this on every used car, no exceptions
Tires — tread depth and date code on sidewall
Over 6 years old → replace. Budget $600–900 for a set
Brakes — pad thickness and rotor condition · budget $300–500 if low
Coolant — clean, not rusty or milky
Milky = possible head gasket leak — walk away
Get insurance quote before signing anything
Check credit union rate before dealer financing